If this is your first visit, be sure to
check out the FAQ by clicking the
link above. You may have to register
before you can post: click the register link above to proceed. To start viewing messages,
select the forum that you want to visit from the selection below.

Announcement

Collapse

Forum Issues Update

We are continuing to work diligently to resolve the issues currently being experienced with the PhotoPlog. Thank you for your patience!

Weather proofing Chimney - gabled roof

11-12-2007, 08:38 AM

We have decided on a gabled roof over the oven. For roofing material I'm thinking about standard shingles to match the house or a metal roof (several neighbors have pole-barns with green or red metal roofs which would look nice)

How do I transition the Duratech pipe through the top of the gable roof and weatherproof it? Duratech sells flashing for angled roofs and flat roofs, but nothing for a chimney that goes through the top. I attached a picture to better explain my question.

Also: If I want to do a shingle roof, what material do I use for subroofing? I don't really want to use plywood due to the heat potential, and I'm not sure if I can nail shingles into Durock/Hardibacker. Any ideas?

I used OSB roof decking (tech shield from Home Depot) on mine. As long as you have a good insulation barrier ( I have 4 different layers) then there are no worries about the roof. As an added precaution I used the tech shield because of the foil covering, foil side down. Probably not needed, but it was cheap insurance. Try putting your hand on the shingles on a hot summer day, OWW! It is alot hotter than the inside of my oven will get.

You are right about the chimney pass thru, I could not find one anywhere either, so I made one. I cut the wood so it would be 8 inches away from the chimney pipe. Then I used metal flashing to cover most of the exposed gap, leaving about 1/2 inch space between the chimney and flashing (being cautious again). I should add that while doing the curing fires I put my hand on the outside of the Duratech to see how hot it would get. That Duratech is great stuff as it did not get more than warm. Then down went the felt paper. Next, I cut some scrap cement board onto 4 rectangular pieces, two notched for the peak of the roof, to make a box (fake chimney) around the pipe, if you can imagine what I mean. Screwed the "fake chimney" to the roof. Bought a tube of fire barrier sealant and filled the inside gaps of the box. After that set-up I finished filling the chimney with the LaHabra Wall (stucco scratch coat) till I had it flush on top and then sloped it just in case any water from rain got under my cap. Then shingle and stucco the outside of the chimney.